991
| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 991 by topic |
|---|
| Leaders |
| Categories |
|
| Gregorian calendar | 991 CMXCI |
| Ab urbe condita | 1744 |
| Armenian calendar | 440 ԹՎ ՆԽ |
| Assyrian calendar | 5741 |
| Balinese saka calendar | 912–913 |
| Bengali calendar | 397–398 |
| Berber calendar | 1941 |
| Buddhist calendar | 1535 |
| Burmese calendar | 353 |
| Byzantine calendar | 6499–6500 |
| Chinese calendar | 庚寅年 (Metal Tiger) 3688 or 3481 — to — 辛卯年 (Metal Rabbit) 3689 or 3482 |
| Coptic calendar | 707–708 |
| Discordian calendar | 2157 |
| Ethiopian calendar | 983–984 |
| Hebrew calendar | 4751–4752 |
| Hindu calendars | |
| - Vikram Samvat | 1047–1048 |
| - Shaka Samvat | 912–913 |
| - Kali Yuga | 4091–4092 |
| Holocene calendar | 10991 |
| Iranian calendar | 369–370 |
| Islamic calendar | 380–381 |
| Japanese calendar | Shōryaku 2 (正暦２年) |
| Javanese calendar | 892–893 |
| Julian calendar | 991 CMXCI |
| Korean calendar | 3324 |
| Minguo calendar | 921 before ROC 民前921年 |
| Nanakshahi calendar | −477 |
| Seleucid era | 1302/1303 AG |
| Thai solar calendar | 1533–1534 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 1117 or 736 or −36 — to — 阴金兔年 (female Iron-Rabbit) 1118 or 737 or −35 |
Year 991 (CMXCI) was a common year starting on Thursday of the Julian calendar.